What did your trainer say about what happened in the second video? To me she was clearly uncomfortable with the pressure and then showed avoidance initially before getting a grip and leaving. Did he actually hit her, or just place his hand on her? Was she done for the day after that? I would be curious to see how she engaged the next time. And I wouldn't have wanted to leave on that note.
"An excess of size is an unserviceable feature for breeding, his powers of endurance, his speed and the smartness of his movements suffer in all circumstances. Giants are never nimble."-Creator of GSD